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Irradiation of the chest or chest wall has been shown to cause calcific aortic stenosis. However, the mechanisms are unknown. Aortic valve interstitial cells have been implicated in the pathogenesis of aortic stenosis; they have been shown to change from the phenotype of a myofibroblast to an osteoblastlike cell. We therefore hypothesized that irradiation of human aortic valve interstitial cells induces an osteogenic phenotype. In isolated human aortic valve interstitial cells, our purpose was to determine the effect of irradiation on the production of osteogenic factors: (1) bone morphogenetic protein 2, (2) osteopontin, (3) alkaline phosphatase, and (4) the transcription factor Runx2.

Radiation induces osteogenesis in human aortic valve interstitial cells